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| author | Jens Axboe <axboe@fb.com> | 2014-05-20 21:49:02 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-05-20 21:49:02 +0400 |
| commit | e3a2b3f931f59d5284abd13faf8bded726884ffd (patch) | |
| tree | f5426a4745996e95afc2f01f826e846710929dc2 /block/blk.h | |
| parent | 64b14519e5913e8d4de9f2e5d9ef59abba3ed83d (diff) | |
| download | linux-e3a2b3f931f59d5284abd13faf8bded726884ffd.tar.xz | |
blk-mq: allow changing of queue depth through sysfs
For request_fn based devices, the block layer exports a 'nr_requests'
file through sysfs to allow adjusting of queue depth on the fly.
Currently this returns -EINVAL for blk-mq, since it's not wired up.
Wire this up for blk-mq, so that it now also always dynamic
adjustments of the allowed queue depth for any given block device
managed by blk-mq.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h index 95cab70000e3..45385e9abf6f 100644 --- a/block/blk.h +++ b/block/blk.h @@ -188,6 +188,8 @@ static inline int queue_congestion_off_threshold(struct request_queue *q) return q->nr_congestion_off; } +extern int blk_update_nr_requests(struct request_queue *, unsigned int); + /* * Contribute to IO statistics IFF: * |